At the end of the lore page for Arcane Odyssey Vetex talks about how the Peacekeeper went on to find the absorption curse and the rest of the sea curses and Averill went out to sea to discover new lands.
Peacekeeper: We might find the Peacekeeper whilst of his journey for an npc interaction cut-scene of some sorts
Averill: We could find Averill during his journey to discover new lands, probably coming across the ruins of the seven seas
They stole the absorption curse from Durza and went on to collect as many curses as possible. He also killed Hades which was an unknown, and now PK himself is an unknown.
Although previous to that he got trained by Freedrock which made him incredibly powerful.
Their ashes were soaking up magic energy for centuries before they were revived so they were a natural prodigy from the start. Then after defeating Durza they went searching for the absorption curse and have that now too.